A) 70 km/h
B) 200 km/h
C) 250 km/h
D) 350 km/h
Correct Answer: A
Solution :
Let the speed of first train be 7x km/h. Then, the speed of the second train is 8x km/h But, speed of the second train \[=\frac{400}{5}\]km/h = 80 km/h \[\therefore \] \[8x=80\Rightarrow x=10\] Hence, the speed of first train is \[(7\times 10)\] km /h = 80 km/hYou need to login to perform this action.
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